Hi Maria,

You've not told us anything about the trim level, equipment or engine, so that makes it harder to pin things down. In any case, it's never easy to predict what any dealer will offer for a trade-in as it's not a fixed thing. It will depend massively on the specific car, but also on how much they do or do not want such a car to sell on, or how desperate they are to sell you another car. 

In any case, 3008s registered with a 201 plate currently are listed for sale on Carzone for between €30,000 and €37,000. Expect a couple of thousand less as a trade-in offer.